Improvement in locomotive rocker shafts and boxes



3.1a w. CROW'IHER.'

LOCOMOTIVE ROCKER-SHAFTS AND BOXES.

No. 173,213. titan-tea Fe-b. 8,1876.

' TED PATENT] JOHN T. CROWTHER,'OF oARBoNDALn, AND WILLIAM J. cnowTHEn, 0F URBANA, ILLINOIS.

IMPROVEMENT IN LOCOMOTIVE ROCKER SHAFTS AND BOXES.

Specification forming part f Letters Patent No. 173,213, dated FebruaryS, 1876; application filed November 13, 1875.

To all whom it may concern:

' tion:

Figure 1 is a side view of our improved rocker-box. Fig. 2' is an end view of the same. Fig. 3 is a longitudinal section of the same, taken through the line war, Fig. 1. Fig. etis an end view of the bushing. Fig.5 is an end view of the bushing, showing a modified form. Fig. 6 is an end view of the rocker-shaft, showing the key-seat, and in dotted lines'the relative position of the key-seats in the other end of the shaft.

Similar letters of reference indicate corresponding parts. The object of this invention is to save time,

. labor, and expense in repairing rocker-shafts and their boxes when worn oblong.

The invention consists in the open bushing, made in one or two pieces, and provided with.

three sets of oil-holes, in combination with the rock-shaft and the box; and in the rockshaft made with three key-seats ineach end, the key-seats in the one end being opposite the centers of the spaces between the keyseats in the other end, to enable the shaft to be adjusted in six different positions, as hereinafter fully described.

It is well known that the rocker-shafts of locomotive-engines soon wear oblong, which causes a loss of motion to the valves, and a corresponding loss of power to the engine. This has heretofore been repaired by removing the rocker-shaft, and turning it down to. a true round, and removing the boxes, planing off their adjacent faces, and reboring them to fit upon the diminished shaft. The bolt-holes are'then lengthened out, and the boxes replaced uponthe engineframe. This changes the relative position of the rock-shaft,

and' disarranges the entirevalve -Inotion.

This loss of time and labor is greatly lessened by our invention, which we will now describe. I

A is the box, which is made in two parts, i

and secured to the engine-frame in the usual way. B is the rock-shaft, upon the ends of which are formed, or to them are attached,

. the arms 0. When the shaftB becomes worn shaft and the box, is then inserted in the box or applied to the shaft. The bushing D is made open upon one side, when the arms 0 are detachable, and is made in two parts or halves, when the arms 0 are formed solid upon the shaft B. r

In the bushing D are formed three sets of oil-holes,- d, corresponding in position with the oil-holes a of the box A, so that the said bushing can be adjusted in three different po- 7 sitions to cause it to wear evenly. 1

In this way the shaft can be repaired easily and quickly, and without disarranging in the least the valve-motion.

The bosses of the shaft-arms G are made open at the end, and are drawn together around the ends of the shaftB by pinch-screws O. The bosses of the arms 0 have each a single feather or key, E, formed upon or secured to them upon the side of their bearing opposite the opening in their ends.

In each end of the rock-shaft B are formed three equidistant key-seats, b, the seats of the one end being opposite the centers of the spaces between the key-seats of the other end,

Having thus described, our Invention, we

claim as new and desire to secure by Letters Patent- 1. The rock-shaft B, made with three keyseats, I), in each end, the key-seats in the one end being opposite the centers of the spaces between the key-seats in the other end, to enable the shaft to be adjusted insix different -ferent positions, and thuseqnalize wear, in positions, substantially as herein shown and the manner set forth. described.

. JOHN T. OROWTHER v 2. The combination, w1th a locomotive roeker-box, having three sets of oil-holes, a; of a WILLIAM (JROWTHER two-part bushing, D, having three correspond- Witnesses: ing sets of oil-holes, as shown and described, E. H. CUSHMAN, to enable the bushing to be adjusted in dif- GEO. A. GILLILAND. 

